Mechanism for forming lock washers



Dec-.16, 1930. c. G. OLSON I v ,78 ,28

MECHANISM FOR FQRMING LOCK WASHERS Filed Nov. 17, l927 2 3 N NH L mw Q J N 7 uoogfi fl gumm Q 0 INVENTOR CHRL 6. 0L SON yfg 73 I I A TTORNEY j 50 nated.

Patented Dec 16, 193% i QUMT srras cm G. Orson, or onIcAe'o, ILLIn Is, AssIeN'On r sHAxErRoorIOdK WASHER COM- rANY, mcOnrOIwrnn-Or vciauoae'ro, ILLINOIS, A CORPORATION or DELAWARE MECHANISM FOR FORMINGiOCK WASHERS Application filed November 17, 1927. Serial No. 233,749.

I This invention relates to dies for punching certain articles of characteristic shape from sheet metal and pertains more particularly to a novel arrangementof progressive dies for the rapid production, from stock strips, of lock washers of the "so-called rolling tooth type, commonly known in the market as shakeproof lock washers and described in United States Patent No. 1,419,564, issued to Richard T. Hosking June 13, 1922.

' The claimed novelty in this invention is found in a new arrangement of a plurality of progressive dies, by which a certain method of producing pronged. washers, s'etforth in the patent issued to J. R. Richer, February 14,

19283510. 1,659,161, carried out on a basis of a rapid production. The method, as described in that patent, is a method bf procedure whereby two diiferent types of rolling tooth washers are. produced from the same stock strip, one having external and the other internal prongs. The procedure comprisesunching'a hole in the strip, stamping out a lank concentric with the hole and having a serrated edge forming regular prongs or teeth around its periphery, and twisting the external prongs thus formed out of the plane of the blank, and finally twisting the internal prongs out of the plane of the strip and a0 stamping out a second concentric blank with I a circular periphery- The novel mechanical-means by which the feeding means, as rollers 2, 3, 4, in theusual aforesaid method is- 'racticed comprises-an arrangement and com ination of progressive dies by which internal toothed washers and external toothed washers are rapidly and cheaplyproduced from\th e same stock strip. Another novel .feature of improvement is in the structure of certain of the dies whereby 40 qele'ments, mostly old in themselvegI'but cO-- operatin ;to produce thein'ew and useful re sults of t theteeth of both washers are respectively twisted about their longitudinal axes while" her words, before they are:

e method of above desi ofthe progressively arranged dies, the stock strip and the feeding rolls. r

Fig. 3 is a vertical section through the dies constituting the right-hand half of the series shown in Fig. 2. v

- Fig. 4 is a detail of the external toothed washer.

vFig. 5 is a sectional detail of one rib of the punch and two ribs of the die for twisting the teeth ofthe external toothed washer and at the same operation severing the washer' from the stock strip.

Fig. 6 is a detail of the internal toothed washer.

As is clearly shown in the drawings, my

progressive die arrangement and mode of Operatlon isa combination of certain punching andforming elements. Together they constitute the claimed means by which I produce from the same stock strip washers, one having external and the other having complemental internal, axially twisted teeth. I I The strip. 1 is propelled by suitable striplarge productioncommercial-scale I prefer to divide thejprogressive dies into two groups, one group of dies making the external and the other making the internal to'othedwashers. .I do this merel for. the sake of structuralsimplicityand acility ofrepairto the dies, J

butfor. the purpose of this description I have shown and will describe them as being combined in acontinuousi assembl a However the progressive. d e is arranged,

' toothed dies shown at whether in a single structure as shown in 5 ings, is wide enough, and the spacings are far.

enough apart to provide material from which pronged washers of the desired size can be punched.

Punches 5, 6 and dies 5a, 6a for simultaneously piercing and piloting the strip, are provided, as is usual in progressive dies of this character, and 7 is a blanking punch, externally ribbed or fluted lengthwise and adapted with its die 7 a to blank a washer 1a and push it part way throughthe strip without severing it entirely.

A second punch 8 having longitudinal ribs with beveled work-engaging faces 9 pushes the partly severed washer 1a completely through the, stock strip and simultaneously twists the teeth 10 or prongs of the washer out of the plane of the blank. The means employed for twisting these pron s is illus- 5. The sp dces X for etween adjacent inter-r trated in detail in F i the washer prongs 10%) mil ribs 11 of the die members 80., are narrower than those in the preceding blanking die 7a and in consequence the beveled faces 9 twist the prongs 10 while the washer is being pushed between the ribs 11 of the die 8a and severed from strip. 1 I 1 There is now stamped out a blank, concen- I I trio with the first pierced hole, having a serrated edge forming regular twisted teeth around its'periphen p Punch 8 is the distance of two successive equal steps of advancement of the stock strip away from the punch 7 in order to provide room for the dies 7a and 8a, 7 After leaving die 8 the stock strip, deprived of its external toothed washer, passes on. to the. next operation, removal of a concentric internal toothed washer. If desired, the stock strip 1 at this stage may be coiled, to be later fed into the internal the right-hand side in Fig. 1 and in section in Fig. 3.; In any case, however, a die 12 is provided to twist out of the plane of the strip 1 the internal teeth 13 left in the stock after it has passedthe group of dies that formed washers. It will be'noted that the twisting of the internal teeth 13 occurs while the teeth are as yet integral partsof the stock strip;

Die 12 is provided with longitudinal ribs, the ends of which comprise a serrated series of forming faces '14.

In two moves of the stock strip the'newly twisted teeth arrive at a punch and die 15' which is adapted to flatten the dicated by'the dotted circle, Fig. 1.

The flattened stock strip is next operated Fig. 4',- which is the v feeding means, dies for the external toothed last mentione l washer, as 1n- By the means above described I have produced a mechanism for rapidly operatin the method as stated, namely, punching t rce concentric openings in the strip, the smaller having a circular periphery, the intermediate having a serrated perlphery forming a series having a circular periphery, thus cutting blanks, one having external, -and the'other having complemental internal teeth, and twisting the teeth of both washers while said teeth still remain integral with the stock strIip aving thus described my invention, what I claim and desire to secure by Letters Patent is:

1. Means for producing two different kinds of pronged lock washers from the same stock strip, comprising strip-feedin means, dies for progressively piercing an piloting the strip, a ribbed punch and a complemental ribbed die adapted to blank one of said washers and topush it part way only through the strip, a second ribbed punch and a ribbed die havin beveled work-engaging faces on its ribs adapted to push said washer completely through the stock and to simultaneously twist its prongs, the spaces for the prongs between adjacent ribs in said last mentioned die being narrower'than those in the said blanking die,"a pilot,atooth-twisting punch and die adapted to twist the prongs remaining in the stock strip after passing the above mentioned dies, a die for flattening the area of the an nula-r ring of material surrounding thevsaid last mentioned prongs and a blanking punch and die for severing said flattened ring from the stock strip, thereby. producing a second washer.

2. A means for producing pronged lock washers from stock strip comprising strip progressively piercing and piloting the strip,- a co-operating ribbed punch-and ribbed die adapted to blank a washer and to push it part way only through the strip, a second ribbed punch having beveled work-engaging faces on its ribs adapted to push said washer completely through the stock and a ribbed die co-operating therewith to simultaneously twist the prongs of the] washer, .the s aces between the ribs of said Q die being? narrower than the corresponding spaces of said ribbed blanking die, thereby producing one complete lock washer and preparing the stock strip for simultaneously yielding other complemental washers.

In testimony whereof,'I aifix my signature.

CARL e. OLSON.

.of regular prongs or teeth and the largest 

